Effect of strain rate on the kinetics of hot deformation of AZ31 with different initial texture

In this work, the effects of strain rate and initial texture on the flow behaviour and microstructure evolution on AZ31 Mg alloy were studied by compression tests. Cast plates were, homogenized and hot rolled and then compression tests were performed on samples with longitudinal axes either parallel to the rolling direction (RD) or the normal direction (ND). Compression tests were performed to various strains and samples were quenched to investigate the effect of dynamic recrystallization on the texture and microstructural evolution. Results show that for the samples machined in both rolling and normal direction, the rate of texture evolution is increased by increasing strain rate. The deformation mechanism was changed by increasing the strain rate for ND samples and at strain rate of 1 s-1 from slip dominated flow to twin dominated flow. By using EBSD, the deformation mechanism and twinning types were investigated and double and tension twins were detected.